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Reports empty string operands in string concatenations.
Concatenation with the empty string can be used to convert
non-<code>String</code> objects or primitives into <code>String</code>s,
but it can be clearer to use a <code>String.valueOf()</code> method call.
<p>
  A quick-fix is suggested to simplify the concatenation.
</p>
<p><b>Example:</b></p>
<pre><code>
  void foo(int x, int y) {
    String s = "" + x + " ; " + y;
  }
</code></pre>
<p>After the quick-fix is applied:</p>
<pre><code>
  void foo(int x, int y) {
    String s = x + " ; " + y;
  }
</code></pre>
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<p>
  Use the <b>Report only where empty strings can be removed without other changes</b>
  option to ignore cases cases where removing the empty string
  will require adding a <code>String.valueOf()</code> conversion of another operand.
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